Radii of Gyration of Ring-Shaped Polystyrenes with High Purity in Dilute Solutions.

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• 作者：Atsushi Takano ; Yutaka Ohta ; Keisuke Masuoka ; Kazuki Matsubara ; Tomohiro Nakano ; Atsushi Hieno ; Masanao Itakura ; Kayori Takahashi ; Shinichi Kinugasa ; Daisuke Kawaguchi ; Yoshiaki Takahashi ; Yushu Matsushita
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：January 10, 2012
• 年：2012
• 卷：45
• 期：1
• 页码：369-373
• 全文大小：251K
• 年卷期：v.45,no.1(January 10, 2012)
• ISSN：1520-5835

文摘

Ring polystyrenes (PSs) were synthesized by anionic polymerization technique and purified with preparative size-exclusion chromatography (SEC). Seven ring PSs with their weight-average molecular weight (M_w) ranging from 17k to 570k were prepared and they were confirmed to have high purities all over 96% by liquid chromatography at the chromatographic critical condition (LCCC) analyses. Their radii of gyration (R_gs) were determined in benzene-d₆ as a good solvent and in cyclohexane-d₁₂ or cyclohexane-h₁₂ as 螛 solvents by small-angle neutron scattering (SANS) or light scattering (LS). It has been found that R_gs of ring polymers are scaled with M_w as R_gM_w^0.60 in a good solvent and as R_gM_w^0.53 in 螛 solvents. Moreover it was confirmed that g factors, R_g²_(Ring)/R_g²_(Linear), obtained in 螛 solvents are meaningfully larger than theoretically predicted values owing to the topological effect stored in ring molecules.